Speaker and Tweets ideas!

need an idea on what speakers to put in, size and all. i can put in 6.5 in factory door panels, i planned to do 4 6.5 on these doors, but thought maybe some 8s would be needed to keep up with this set up.

So far my set up is in a 2004 chevy tahoe z71
crescendo BC 5800 @.5 ohm
four Fi Bl 18 with cooling option in a 38 ft^3 box @ 35 hertz

Re: Speaker and Tweets ideas!

budget would be around 1500 for amp and speakers. over all want loud crisp sound, not just super loud, but clear as clear as i can get with out loosing to much of the decibels. i would like to keep it all factory in the case i need to sell the car, but i can make myself some custom panels if necessary, i have no idea what amp to be running, im not use to having to do the speakers. so hopefully some of this information helps.